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59 L. Q. Rev. 327 (1943)
Mistake of Law

handle is hein.journals/lqr59 and id is 335 raw text is: MISTAKE OF LAW.
T HE chief purpose of this article is to ascertain what is meant by
mistake of law. It is a commonplace that, whereas mistake of
fact is in some circumstances a ground for relieving the party who is
mistaken from a legal obligation, mistake of law is in general no excuse.
But when we ask what is the distinction between ' law' and ' fact' in
this connexion, no exact answer is discoverable in the law reports. The
reason for this is that the intrinsic difficulty of laying down any hard
and fast line separating the two ideas is so great as to make the task
a practical impossibility. 'There is not', said Jessel M.R. in Eaglesfield
v. Marquis of Londonderry, ' a single fact connected with personal status
that does not, more or less, involve a question of law. If you state that
a man is the eldest son of a mariiage, you state a question of law,
because you must know that there has been a valid marriage, and that
that man was the first-born son after the marriage, or, in some countries,
before. Therefore, to state it is not a representation of fact seems to
arise from a confusion of ideas. It is not less a fact because that fact
involves some knowledge or relation of law. There is hardly any fact
which does not involve it. If you state that a man is in possession of
an estate of £10,000 a year, the notion of possession is a legal notion,
and involves knowledge of law; nor can any other fact in connection
with property be stated which does not involve a knowledge of law.'
The subsequent history of the case afforded a practical illustration of the
difficulty of distinguishing a mistake of law from one of fact, for while
Jessel M.R. held that in the circumstances of the case (the details of
which do not concern us here) the mistake was one of fact, the Court
of Appeal reversed his decision on the ground that it was a mistake of
law. Bowen L.J., as great a master of the Common Law as Jessel was
of Equity, put another example in West London Commercial Bank v.
Kitson 2: ' Suppose I were to say I have a private Act of Parliament
which gives me power to do so and so. Is not that an assertion that I
have such an Act of Parliament ? It appears to me to be as much a
representation of a matter of fact as if I had said I have a particular
bound copy of Johnson's Dictionary.'
It is as well to explain what we mean by 'mistake ' before examining
its relation to fact and to law. It not only signifies a positive belief in
the existence of something which in reality does not exist but it may
also include sheer ignorance of something relevant to the transaction
in hand. This may seem to be an extension of ' mistake' beyond its
popular meaning, but it certainly appears in several of the reported cases
where total inadvertence to the fact in question was treated as mistake
in relation to it. The maxim, ignorantia iuris non excusat, which is of
respectable antiquity in our law, is to some extent responsible for this
wide meaning of mistake.
It is necessary in investigating the distinction between mistake of law
1 (1875) 4 Ch. D. 693, 703.
2 (1884) 13 Q. B. D. 860, 863.

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